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Advise please

 
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  #1  
Old 07-31-2007, 05:15 PM
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Advise please

I hunt exclusively on flat land, but this fall I will be hunting for deer in rough hilly terrain, and I will have to at some point make an up hill shot or a down hill shot.
I shoot a .300 win mag and I am 2" high a 100 yards, so when shooting up hill or down hill will the POI be the same or will I have to shoot high or low?
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Old 07-31-2007, 06:40 PM
gbp gbp is offline
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I know this may be rather complicated but Shawn has written a very good article on this earlier. Here is the link, I'm still trying to sort it all out myself. What ranges do you anticipate?

Up/Downhill corrections
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  #3  
Old 07-31-2007, 06:47 PM
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Shooting up hill oe down hill the trajectory will be flatter....How much flatter depends on the angle and the distance.....
Acosine indicator will allow one to know the angle and balistics program will give the correction...........


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Old 08-01-2007, 12:07 PM
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The ranges that I will be shooting at will be from 0-500 yards at max. I guess the problem that I have is that I do not have a scope with target turrets or a cosine indicator. I shoot a .300 win mag with 168gr Barnes TSX bullets with a Leupold VXII with a heavy duplex reticle.
I am very confident with my rifle shooting out to 500 yards, but I am unsure of whether I should be shooting below or above a animal at say 300 yards shooting either up hill or down hill.
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Old 08-01-2007, 12:56 PM
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Lefty

I'll let others go into the exact calculations, but out to 500 yards there won't be more than a couple of inches of change in POI unless your uphill/downhill angle is a lot more than 20 degrees...which is really pretty steep for most western hunting in hilly country at a distance as great as 500 yards.

To correct, you would aim those couple of inches lower than normal. The reason for this is that the gravity vector operates on the bullet in a direction not quite perpendicular to the bullet's flight. Therefor the bullet doesn't drop quite as fast as it traverses the 500 yard distance.

Think of it this way. Hold your right arm out parallel with the ground while hanging a 20 pound weight from your hand. Notice how much effort it takes at this angle. Now move your arm's angle to be 45 degrees. You'll notice it takes less effort to hold the same 10 pound weight.
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Last edited by Len Backus; 08-01-2007 at 01:04 PM.
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  #6  
Old 08-01-2007, 01:33 PM
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Quote:
Originally Posted by lefty15 View Post
I hunt exclusively on flat land, but this fall I will be hunting for deer in rough hilly terrain, and I will have to at some point make an up hill shot or a down hill shot.
I shoot a .300 win mag and I am 2" high a 100 yards, so when shooting up hill or down hill will the POI be the same or will I have to shoot high or low?

Hi Lefty,

Can you give me the conditions to run them in ballistic program to find your bullet drop:
round grain - 180
bullet BC -
temperature -
elevation (ft) -
muzzle speed (fps) -
distance < 500yards
angle cosine -

As Len mentions, you do not suppouse to have big drop when you are shooting up or down hill not more then 20 degree at that distance, but is better to check just in case....

Thanks Chris
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  #7  
Old 08-01-2007, 04:00 PM
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Hey Chris here is the info, thank-you very much for the help!

round grain - 168GR BARNES TSX
bullet BC - .404
temperature - 32F
elevation (ft) - 3200FT
muzzle speed (fps) - 3200FPS
distance < 500yards- 300 YARDS
angle cosine - ??????
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